error: inherent impls cannot be negative
  --> $DIR/syntax-trait-polarity.rs:7:7
   |
LL | impl !TestType {}
   |      -^^^^^^^^ inherent impl for this type
   |      |
   |      negative because of this

error[E0198]: negative impls cannot be unsafe
  --> $DIR/syntax-trait-polarity.rs:12:13
   |
LL | unsafe impl !Send for TestType {}
   | ------      -^^^^
   | |           |
   | |           negative because of this
   | unsafe because of this

error: inherent impls cannot be negative
  --> $DIR/syntax-trait-polarity.rs:19:10
   |
LL | impl<T> !TestType2<T> {}
   |         -^^^^^^^^^^^^ inherent impl for this type
   |         |
   |         negative because of this

error[E0198]: negative impls cannot be unsafe
  --> $DIR/syntax-trait-polarity.rs:22:16
   |
LL | unsafe impl<T> !Send for TestType2<T> {}
   | ------         -^^^^
   | |              |
   | |              negative because of this
   | unsafe because of this

error[E0192]: invalid negative impl
  --> $DIR/syntax-trait-polarity.rs:14:6
   |
LL | impl !TestTrait for TestType {}
   |      ^^^^^^^^^^
   |
   = note: negative impls are only allowed for auto traits, like `Send` and `Sync`

error[E0192]: invalid negative impl
  --> $DIR/syntax-trait-polarity.rs:24:9
   |
LL | impl<T> !TestTrait for TestType2<T> {}
   |         ^^^^^^^^^^
   |
   = note: negative impls are only allowed for auto traits, like `Send` and `Sync`

error: aborting due to 6 previous errors

Some errors have detailed explanations: E0192, E0198.
For more information about an error, try `rustc --explain E0192`.